Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Protective Method Applicable to Air Vent Connected with a Heat Transport Pipe

열수송관에 연결된 에어벤트에 적용 가능한 부식 방지 방안

  • Min Ji Song (Department of Materials Science and Engineering, Chungnam National University) ;
  • Gahyun Choi (Department of Materials Science and Engineering, Chungnam National University) ;
  • Woo Cheol Kim (R&D Institute, Korea District Heating Corp.) ;
  • Soo Yeol Lee (Department of Materials Science and Engineering, Chungnam National University)
  • 송민지 (충남대학교 신소재공학과) ;
  • 최가현 (충남대학교 신소재공학과) ;
  • 김우철 (한국지역난방공사 미래개발원) ;
  • 이수열 (충남대학교 신소재공학과)
  • Received : 2023.04.16
  • Accepted : 2023.04.19
  • Published : 2023.04.30
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Abstract

This study aimed to elucidate causes of corrosion of heat transport pipes and air vents installed under a manhole of heat transport facilities and suggest effective anticorrosive measures by applying paints or adhesive tapes. It was found that air vent corrosion was attributed to corrosion under insulation caused by the inflow of water and the enrichment of chloride ions. The infiltrated water caused a hydrolysis of polyurethane foam (PUF) insulation by concentrating chloride ions at the interface between a pipe and the PUF. As insulator deteriorated, more chloride ions were eluted as confirmed by ion chromatograph (IC) analysis. As an effective method to prevent air vent corrosion, different types of paints and adhesive tapes with higher corrosion resistance on chloride ions were applied and environmental resistance tests were performed with those samples. Based on environmental test results of samples exposed to 10% HCl solution, it was revealed that a wax tape was the most adequate from a viewpoint of stability at operating condition, environmental resistance, surface treatment, and field applicability.

Keywords

Acknowledgement

본 연구는 한국지역난방공사의 지원을 받아 연구를 수행하였습니다.

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